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Note 10 - Fair Value Measurements - Assets and Liiabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivative instruments $ (578) $ (258)
Preferred stock, trust preferred securities, exchange traded debt instruments, and other equity instruments 120,728 106,146
Fair Value, Inputs, Level 1 [Member]    
Derivative instruments (578) (258)
Preferred stock, trust preferred securities, exchange traded debt instruments, and other equity instruments 120,728 106,146
Fair Value, Inputs, Level 2 [Member]    
Derivative instruments
Preferred stock, trust preferred securities, exchange traded debt instruments, and other equity instruments
Fair Value, Inputs, Level 3 [Member]    
Derivative instruments
Preferred stock, trust preferred securities, exchange traded debt instruments, and other equity instruments